This reverts commit 6a263d6.

Added Subject Names to teacher page

Added Subject Names to teacher page

1. Import button now checks for any matching record and overrides the content with the new data

2. on creation, the data already present is iterated and checked for any duplicate

3. data exported from auth teachers now doesn't have the created property

4. Added name validation which checks for presence of '.' and numbers

5.

note: the semesterData is initially set an object instead of it being undefined coz its causing an uncontrolled state

…room

… changes

…if conditions

…. data manipulation wont occur in those variables